文献类型：期刊文献

英文题名：Novel bipolar host materials based on benzimidazole-hybridized phenanthridine for efficient red PhOLEDs

作者：Yang, Yong[1,2];Zhang, Daqing[1,2];Wu, Zhongxin[3];Zhou, Haitao[4];Huang, Jinhai[4];Guo, Lifang[1,2];Zhang, Zhiyun[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Wenzhou Inst Ind & Sci, 17 Middle Sch Rd, Wenzhou City 325028, Zhejiang Provin, Peoples R China;[4]Shanghai Taoe Chem Technol Co Ltd, Shanghai, Peoples R China

年份：2024

卷号：230

外文期刊名：DYES AND PIGMENTS

收录：;EI(收录号：20242916703671);WOS:【SCI-EXPANDED(收录号:WOS:001271972100001)】；

基金：We are thankful for financial support from the NSFC/China (22335004, 22175063, 22004036) .

语种：英文

外文关键词：Bipolar; Host materials; PhOLEDs; Benzimidazole-hybridized phenanthridine; EQE

摘要：In this work, two innovative bipolar host materials, TPA-BIP and Cz-BIP, were designed and synthesized based on benzimidazole-hybridized phenanthridine (BIP) moiety as the electron transport unit. Compared to the widely used electronic transport unit benzimidazole, the BIP unit possesses a large planar rigid structure that can effectively enhance the thermal stability and the electron transfer capability of materials. Both materials exhibit good thermal stability respectively with Tg of 113 degrees C and 141 degrees C, proper HOMO/LUMO energy levels, and balance carrier transport capabilities. The red phosphorescent organic light-emitting diode prepared based on both materials achieve relatively high luminescence efficiency and relatively low efficiency roll-off. In particular, the EQEmax of the R1 device using TPA-BIP as the host material reaches 21.5 %, which is more superior than that of the conventional host material CBP (EQEmax of 9.84 %). Even at 1000 cd/m2, the device still achieves an EQE of 21.3 % with virtually no decrease. In conclusion, the results demonstrate the broad development potential of these BIP-based host materials for red PhOLEDs applications.